Eccentric Handle Latch for Boat Hatches
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Solution Overview
Problem
Existing pressing type latch devices for boat hatches require specific directional operation and installation, making them inconvenient and prone to damage if used incorrectly.
Innovation Solution
A latch device with a handle pivotably connected to two eccentric locations of a disc, allowing for multiple retainable positions and secure operation, featuring a disc with an actuating portion and a handle with pivotal portions for easy installation and secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a D-handle latch requires specific directional operation and 180° rotation for handle insertion, then the latch can achieve secure closing and opening states, but the installation becomes inconvenient and the device is prone to damage from incorrect operation
Solution Approach 1:
The patent employs asymmetric design in the handle and receiving well configuration. The handle has a specific shape that matches the well, but the design allows the handle to be inserted in either direction after rotation, eliminating the need for the installer to remember a specific orientation. This asymmetric yet flexible design resolves the contradiction by maintaining secure engagement while improving installation convenience.
2Reliability
If a D-handle latch requires specific directional operation, then the latch can function properly, but users applying force in the wrong direction cannot open the latch and may damage it
Solution Approach 1:
The patent applies the inversion principle by allowing the handle to be inserted and operated from either direction after 180° rotation. Instead of requiring a specific orientation, the design inverts the constraint, making both orientations valid. This eliminates the risk of damage from incorrect operation while maintaining proper latch functionality.
3Adaptability or versatility
If a handle is pivotably connected to two eccentric locations of a disc, then multiple retainable positions can be achieved, but the device complexity increases
Solution Approach 1:
The patent uses dynamic positioning through the pivotable connection of the handle to two eccentric locations on the disc. The handle can rotate and be retained at multiple positions (including closed position and multiple open positions) through the interaction of the pivotal portions with the disc body. This dynamic mechanism provides versatility while keeping the structure relatively simple compared to multi-component locking systems.
Data Source
AI summary
A pressing type latch device includes a seat, a pivotal seat mounted in the seat, and a handle having a grasping portion pivotably connected to two eccentric locations of the pivotal seat, such that a greater operational height can be formed when the handle is lifted. When the latch device is in one of a plurality of retainable open positions or a retainable closed position, the grasping portion of the handle can be moved to a position to lift the pivotal seat, such that the grasping portion of the handle lies flush with the pivotal seat. On the other hand, when the grasping portion of the handle is lifted to move the pivotal seat downward, the handle and the pivotal seat can rotate freely. Since the latch device includes a closed position and a plurality of open positions, the latch device can be installed and used more easily.